First test for our AltTextBot

find-altless-posts.spec.ts

import { AltTextBot } from './find-altless-posts.js';

let mockAtpAgent;

const resetAtpAgentMock = () => {
    mockAtpAgent = {
        getPost: vi.fn(),
    };
}

vi.mock('@atproto/api', () => ({
    AtpAgent: vi.fn(() => mockAtpAgent),
}));

describe('AltTextBot', () => {
    const postUri = 'postUri';
    let bot: AltTextBot;

    beforeEach(async () => {
        resetAtpAgentMock();
        bot = new AltTextBot();
    });

    it('should initialize a new instance', async () => {
        expect(bot).toBeDefined();
    });

    describe('checkAltInSinglePost()', () => {
        it('should return the error message if fetch post failed', async () => {
            const error = { message: 'error' };
            mockAtpAgent.getPost.mockRejectedValue(error);

            const result = await bot.checkSinglePost(postUri);

            expect(result).toEqual(error);
        });
    });
});